CN111999664A - Battery module testing method and device - Google Patents
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- CN111999664A CN111999664A CN202010872563.5A CN202010872563A CN111999664A CN 111999664 A CN111999664 A CN 111999664A CN 202010872563 A CN202010872563 A CN 202010872563A CN 111999664 A CN111999664 A CN 111999664A
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- 238000012360 testing method Methods 0.000 title claims abstract description 67
- 101150064138 MAP1 gene Proteins 0.000 claims abstract description 13
- 101100075995 Schizosaccharomyces pombe (strain 972 / ATCC 24843) fma2 gene Proteins 0.000 claims abstract description 9
- 101100456045 Schizosaccharomyces pombe (strain 972 / ATCC 24843) map3 gene Proteins 0.000 claims abstract description 9
- 101100400452 Caenorhabditis elegans map-2 gene Proteins 0.000 claims abstract description 4
- 125000006850 spacer group Chemical group 0.000 claims description 16
- 125000004122 cyclic group Chemical group 0.000 claims description 5
- 230000008961 swelling Effects 0.000 abstract 1
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- 238000013461 design Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000002579 anti-swelling effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses a battery module testing method and a device, belonging to the technical field of battery testing, wherein the battery module testing method comprises the following steps: two end plates of the battery module are respectively fixed on the supporting structure through screws; the electric core group is charged and discharged in a circulating mode, the circulating times M of the electric core group are recorded in real time, the variation delta L of the distance between the top ends of the two end plates is measured in real time, and a relation curve map1 of the circulating times M and the variation delta L is obtained; taking out at least one battery cell in the battery module, and placing the force application assembly between two adjacent battery cells; the force application assembly applies acting force to the electric core assembly, the magnitude of the acting force F is detected in real time, the variation delta L of the distance between the top ends of the two end plates is measured in real time, and a relation curve map2 of the acting force F and the variation delta L is obtained; and obtaining a relation graph map3 of the cycle number M and the acting force F of the battery module according to the map1 and the map 2. The cycle life and the swelling force test can be realized by one battery module.
Description
Technical Field
The invention relates to the technical field of battery testing, in particular to a battery module testing method and device.
Background
Lithium ion batteries are increasingly widely used in the fields of consumer electronics, aerospace, energy storage, new energy vehicles and the like due to the characteristics of high energy density, high working voltage, low self-discharge, high charging efficiency, long cycle life, no memory effect and the like.
In the production process of lithium ion batteries, the test of the anti-swelling strength of a battery module comprising one or more cells during a charging cycle is very important, and can be used as a key factor for evaluating the safety of the cell or the battery module structure. At present, in order to obtain the relationship between the cycle life and the expansion force of the battery module, different battery modules are often required to be arranged for cycle life testing and expansion force testing, so that not only is the waste of testing resources and cost caused, but also the testing result often has larger deviation.
Disclosure of Invention
The invention aims to provide a battery module testing method and a battery module testing device, which are used for solving the problems that different battery modules are required to be arranged for cycle life testing and expansive force testing in the prior art, so that not only are testing resources and cost wasted, but also the testing result is always large in deviation.
As the conception, the technical scheme adopted by the invention is as follows:
the invention provides a method for testing a battery module, wherein the battery module comprises a battery cell group and two end plates which are respectively arranged at two ends of the battery cell group, and the method for testing the battery module comprises the following steps:
fixing two end plates of the battery module to the supporting structure through screws respectively;
carrying out cyclic charge and discharge on the electric core group, recording the cycle number M of the electric core group in real time, and measuring the variation delta L of the distance between the top ends of the two end plates in real time to obtain a relation curve map1 of the cycle number M and the variation delta L;
taking out at least one battery cell in the battery module, and placing the force application assembly between two adjacent battery cells;
the force application assembly applies an acting force F to the electric core assembly, the magnitude of the acting force F is detected in real time, the variation delta L of the distance between the top ends of the two end plates is measured in real time, and a relation curve map2 of the acting force F and the variation delta L is obtained;
and (4) calculating a relation curve map3 of the cycle number M and the acting force F of the battery module according to the map1 and the map 2.
Further, the measuring of the variation Δ L includes: and measuring the distance change amount delta L1 from the top end of one end plate in real time through one distance measuring structure, and measuring the distance change amount delta L2 from the top end of the other end plate in real time through the other distance measuring structure, wherein the change amount delta L is delta L1+ delta L2.
Further, when the force application assembly is located between two adjacent battery cells, the number of the battery cells on two sides of the force application assembly is the same in the arrangement direction of the plurality of battery cells of the battery cell group.
The invention also provides a battery module testing device, which is suitable for the battery module testing method in any scheme, and the battery module testing device comprises:
the two end plates can be respectively connected to the supporting structure through screws;
the force application assembly can replace at least one electric core of the electric core group to be arranged between two adjacent electric cores, is used for applying acting force to the electric core group and can detect the magnitude of the acting force in real time;
a ranging assembly configured to measure a variation in a distance between two of the end plate tips in real time. Further, bearing structure includes the base, the interval is provided with two archs on the base, two the end plate can be fixed in two respectively through the screw rod respectively the arch, two it can support and spacing to form between the arch the spacing groove of electric core group.
Further, the force application assembly comprises a force application structure and a pressure sensor, one side of the force application structure can be abutted to one of the two adjacent battery cores, the other side of the force application structure can be abutted to the pressure sensor, and the pressure sensor can be abutted to the other battery core.
Further, the force application structure is an air cylinder or a hydraulic cylinder, and a piston rod of the air cylinder or the hydraulic cylinder abuts against the pressure sensor.
Further, the force application assembly further comprises a supporting piece, and the supporting piece is provided with a limiting groove used for supporting and limiting the force application structure and the pressure sensor.
Further, the force application assembly further comprises a spacer, and when the force application assembly is located between two adjacent electric cores, the spacer is arranged between the force application structure and the corresponding electric core and between the pressure sensor and the corresponding electric core.
Further, the range finding subassembly includes two range finding structures, two the range finding structure is located respectively battery module both sides, the range finding structure be configured into can real-time measurement and correspond the distance between the top of end plate.
The invention has the beneficial effects that:
the invention provides a method and a device for testing a battery module, wherein the method for testing the battery module comprises the steps of fixing two end plates of the battery module on a supporting structure through screws respectively; carrying out cyclic charge and discharge on the electric core group, recording the cycle number M of the electric core group in real time, and measuring the variation delta L of the distance between the top ends of the two end plates in real time to obtain a relation curve map1 of the cycle number M and the variation delta L; taking out at least one battery cell in the battery module, and placing the force application assembly between two adjacent battery cells; the force application assembly applies an acting force F to the electric core assembly, the magnitude of the acting force F is detected in real time, the variation delta L of the distance between the top ends of the two end plates is measured in real time, and a relation curve map2 of the acting force F and the variation delta L is obtained; and (4) calculating a relation curve map3 of the cycle number M and the acting force F of the battery module according to the map1 and the map 2. Compared with the prior art, the cycle life test and the expansive force test can be realized through one battery module, the accuracy of the test result is improved, the waste of test resources is avoided, and the test cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a battery module provided in this embodiment;
fig. 2 is a graph map1 showing the relationship between the number of cycles and the variation provided by the present embodiment;
FIG. 3 is a graph map2 showing the relationship between the applied force and the variation provided by the present embodiment;
FIG. 4 is a graph map3 of the relationship between the number of cycles and the applied force provided by the present embodiment;
FIG. 5 is a schematic structural diagram of a testing apparatus provided in the present invention;
fig. 6 is a first schematic view illustrating a working state of the battery module testing apparatus according to the present invention;
fig. 7 is a schematic diagram of a second operating state of the battery module testing device provided by the invention.
In the figure:
1. a base; 11. a protrusion; 111. a limiting groove; 2. a battery module; 21. the electric core group; 211. an electric core; 22. an end plate; 23. fixing belts; 24. an insulating pad; 3. a force application assembly; 31. a force application structure; 32. a pressure sensor; 33. a support member; 331. a limiting groove; 34. a spacer; 4. a ranging assembly; 41. a ranging structure; 42. and (5) installing a rod.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the present embodiment, a battery module 2 is specifically a square battery module, as shown in fig. 1, the battery module 2 includes an electric core set 21, two end plates 22 respectively disposed at two ends of the electric core set 21, and a fixing band 23 disposed around the end plates 22 and the electric core set 21. It should be noted that the battery cell group 21 includes a plurality of battery cells 211, and the plurality of battery cells 211 are arranged side by side along the thickness direction of the battery cells 211. The two end plates 22 and the fixing band 23 primarily fix the electric core assembly 21, wherein the fixing band 23 may be provided in a plurality, in this embodiment, the fixing band 23 is specifically provided in two, and of course in other embodiments, the fixing band 23 may also be provided in three or more. Further, the battery module 2 further includes an insulating pad 24, and an insulating pad 24 is disposed between the electric core pack 21 and each of the end plates 22.
Specifically, the battery module testing method comprises the following steps:
fixing two end plates 22 of the battery module 2 to the support structure through screws respectively;
in the actual process of the battery module 2, the two end plates 22 are locked on the supporting structure through the screws, so that the battery module 2 can be kept stable, the expansion of the electric core group 21 of the battery module 2 can be restricted by the screws and the end plates 22, and meanwhile, acting force can be applied to the screws and the end plates 22. Therefore, the expansion of the electric core pack 21 needs to be considered for the whole of the electric core pack 21 and the end plates 22, the fixing bands 23 (or the side plates), and the screws in order to evaluate the safety of the whole of the battery module 2 throughout the life cycle.
The electric core assembly 21 is charged and discharged in a circulating manner, the number of times of circulation M of the electric core assembly 21 is recorded in real time, and the variation Δ L of the distance between the top ends of the two end plates 22 is measured in real time, so that a graph map1 (shown in fig. 2) of the relation between the number of times of circulation M and the variation Δ L is obtained.
Wherein M is more than or equal to 1, the variation delta L is a dependent variable, the cycle number M is an independent variable, and the variation delta L is changed along with the change of the cycle number M. It should be noted that, in the actual working process of the battery module 2, the end plate 22 of the battery module 2 is fixed on the support structure through the screw, and in the cyclic charge and discharge process of the battery module 2, the deformation amount of the top end of the end plate 22 of the battery module 2 relative to the bottom end thereof is large. Therefore, the amount of deformation of the entire battery module 2 during the charge and discharge cycle is represented by the amount of change in the distance of the tip end of the end plate 22. The "top end" of end panel 22 herein refers to a location on end panel 22 that is approximately near the height at which its top surface is located.
Further, the measurement of the variation Δ L includes: the distance change Δ L1 from the tip of one of the end plates 22 is measured in real time by one of the distance measuring structures 41, and the distance change Δ L2 from the tip of the other end plate 22 is measured in real time by the other distance measuring structure 41, where the change Δ L is Δ L1+ Δ L2. Specifically, the battery module 2 is located between two distance measuring structures 41, and the two distance measuring structures 41 are arranged at intervals along the arrangement direction of the plurality of battery cells 211 of the battery cell group 21. It can be understood that each distance measuring structure 41 has an initial distance with the top end of the corresponding end plate 22, assuming that the distance is L, as the number of charge and discharge cycles of the electric core pack 21 increases, the electric core pack 21 expands to push the end plate 22, and at this time, the end plate 22 deforms, so that the distance between the top end of each end plate 22 and the corresponding distance measuring structure 41 changes, and the sum of the variation of the distance between each end plate 22 and the corresponding distance measuring structure 41 relative to the initial distance L is the deformation of the whole battery module 2.
At least one battery cell 211 in the battery module 2 is taken out, and the force application assembly 3 is arranged between two adjacent battery cells 211.
In order to improve the accuracy of the test result, the number of the battery cells 211 on both sides of the force application assembly 3 is the same in the arrangement direction of the plurality of battery cells 211 of the battery cell group 21. Specifically, in the present embodiment, the battery core group 21 includes twelve battery cells 211, and four of the battery cells 211 are taken out, and the number of the battery cells 211 on both sides of the force application assembly 3 is the same in the arrangement direction of the twelve battery cells 211, and is four.
The force application assembly 3 applies an acting force F to the electric core group 21, detects the magnitude of the acting force F in real time, and measures the variation delta L of the distance between the top ends of the two end plates 22 in real time to obtain a relation curve map2 (shown in fig. 3) of the acting force F and the variation delta L;
wherein, the variation quantity delta L is a dependent variable, the acting force F is an independent variable, and the variation quantity delta L changes along with the variation of the acting force F. It can be understood that the force application assembly 3 applies force to the battery cells 211 to simulate the expansion force of the battery cell pack 21, and the cyclic charge and discharge of the battery cell pack 21 are omitted. In this process, the variation Δ L in the distance between the tips of the two end plates 22 is measured in real time, and a graph map2 (shown in fig. 3) of the relationship between the applied force F and the variation Δ L is obtained. Further, the measurement of the variation Δ L includes: the distance change Δ L1 from the tip of one of the end plates 22 is measured in real time by one of the distance measuring structures 41, and the distance change Δ L2 from the tip of the other end plate 22 is measured in real time by the other distance measuring structure 41, where the change Δ L is Δ L1+ Δ L2.
A graph map3 (shown in fig. 4) of the relationship between the number M of cycles of the battery module 2 and the applied force F was calculated from map1 and mpa 2.
It can be understood that a relation equation of the cycle number M and the change amount Δ L can be fitted through a relation curve of the cycle number M and the change amount Δ L in the map1, a relation equation of the acting force F and the change amount Δ L can be fitted through a relation curve of the acting force F and the change amount Δ L in the map2, and the two relation equations have the same variable Δ L, so that the relation equation of the cycle number M and the acting force F can be calculated through the two relation equations, and then the map3 is obtained.
By the battery module testing method, the cycle life test and the expansion force test can be realized through one battery module 2, the accuracy of the test result is improved, the waste of test resources is avoided, and the test cost is reduced. And can also be applicable to the measurement of the battery module 2 that has been installed in the battery pack, only need to measure the relation curve graph of effort F and variation Δ L this moment can, combine the relation curve graph of the relation of cycle number M and variation Δ L of the battery module 2 that the battery management system of the battery pack measured, can obtain the relation curve graph of cycle number M and effort F of the battery module 2. In addition, the map3 can also be used to verify whether the end plates 22, the fixing bands 23 (or side plates), and the screws of the battery module 2 meet the design requirements, thereby evaluating the safety of the battery module 2 as a whole over the entire life cycle.
The present embodiment further provides a battery module testing apparatus, as shown in fig. 5, the battery module testing apparatus includes the above-mentioned supporting structure, the force application component 3 and the distance measurement component 4. Specifically, bearing structure includes base 1, is provided with two archs 11 on the base 1, and two end plates 22 can be fixed in base 1 respectively through the screw rod, forms the spacing groove 111 that can support and spacing electric core group 21 between two archs 11. The force application assembly 3 can replace at least one battery cell 211 of the battery cell group 21 and be arranged between two adjacent battery cells 211, so as to apply an acting force to the battery cell group 21 and detect the magnitude of the acting force in real time. The distance measuring assembly 4 is used to measure the amount of change in the distance between the tips of the two end plates 22 in real time. .
Specifically, the force application assembly 3 includes a force application structure 31 and a pressure sensor 32. When the force application assembly 3 is located between two adjacent battery cells 211, one side of the force application structure 31 can abut against one battery cell 211 of the two adjacent battery cells 211, the other side can abut against the pressure sensor 32, and the pressure sensor 32 can abut against the other battery cell 211. In this embodiment, the force application structure 31 may be a cylinder or a hydraulic cylinder, and a piston rod of the cylinder or the hydraulic cylinder abuts against the pressure sensor 32. The acting force is exerted on the electric core group 21 through the piston rod so as to simulate the acting force of the electric core group 21, and the magnitude of the acting force can be measured in real time through the pressure sensor 32.
Further, the force application assembly 3 further includes a support member 33 and a spacer 34, and the support member 33 is provided with a limit groove 331 for supporting and limiting the force application structure 31 and the pressure sensor 32. When the force application assembly 3 is located between two adjacent battery cells 211, the spacers 34 are respectively arranged between one side of the force application structure 31 departing from the pressure sensor 32 and the corresponding battery cell 211 and between one side of the force application structure 31 departing from the pressure sensor 32 and the corresponding battery cell 211, and the support member 33 abuts against the two spacers 34.
It can be understood that when the force application assembly 3 is located between two adjacent battery cells 211, the support 33 is used to support the force application structure 31 and the pressure sensor 32, wherein one spacer 34 is located between the force application structure 31 and the battery cell 211 on the corresponding side, and the other spacer 34 is located between the pressure sensor 32 and the battery cell 211 on the corresponding side, and the applied force of the force application structure 31 is transmitted to the battery cells 211 on both sides through the pressure sensor 32 and the two spacers 34. Through the support of support piece 33 for application of force structure 31 can exert the effort to the central part of electric core 211, and rethread spacer 34 is favorable to making effort evenly distributed, avoids certain position atress of electric core 211 to concentrate and influences the test result.
As shown in fig. 5, the distance measuring assembly 4 includes two distance measuring structures 41, the two distance measuring structures 41 are arranged at intervals along the arrangement direction of the plurality of battery cells 211 of the battery cell group 21, the two distance measuring structures 41 are respectively located at two sides of the battery module 2, and the distance measuring structures 41 can measure the distance between the top ends of the corresponding end plates 22 in real time. In this embodiment, the distance measuring structure 41 is a photoelectric distance meter, and more preferably, the distance measuring structure 41 is a laser distance meter, which has high precision and can improve the measuring result.
Further, the distance measuring assembly 4 further comprises two mounting rods 42, the two distance measuring structures 41 are respectively mounted on the two mounting rods 42, and the height of the distance measuring structure 41 is raised to match the top end of the corresponding end plate 22 through the mounting rods 42. Alternatively, the mounting rod 42 may be a telescopic structure, or the mounting rod 42 may have a plurality of mounting positions in the vertical direction, at which the distance measuring structure 41 can be mounted, so that the battery module measuring device can be adapted to the measurement of the battery modules 2 of different heights.
Further, in the present embodiment, two protrusions 11 are located between two distance measuring structures 41, and the distance between each of the two distance measuring structures 41 and the corresponding protrusion 11 is the same. That is, the initial distance between each of the two ranging structures 41 and the top of the corresponding end plate 22 is the same.
The operation of the battery module testing apparatus will be described in detail below.
In the embodiment, the example that the electric core assembly 21 includes twelve electric cells 211 is taken as an example for description, and of course, in other embodiments, the number of the electric cells 211 included in the electric core assembly 21 may be set according to actual needs. The biasing structure 31 will be described by taking a cylinder as an example.
1. The number of cycles of the battery module 2 and the amount of deformation of the entire battery module 2 were measured.
As shown in fig. 6, the two end plates 22 of the battery module 2 are respectively mounted on the two protrusions 11 by screws, the electric core assembly 21 is located in the limiting groove 111, the initial distance between each distance measuring structure 41 and the top end of the corresponding end plate 22 is the same, assuming that the distance is L, then the electric core assembly 21 is circularly charged and discharged, and the number of cycles M (M is larger than or equal to 1) and the real-time distance between each of the two distance measuring structures 41 and the top end of the corresponding end plate 22 are recorded in real time, assuming that the distance is L2MAnd L3MAt this time, a graph map1 showing the relationship between the number of cycles of the battery module 2 and the deformation amount Δ L of the entire battery module 2 is obtained. When M is 2, the number of cycles of the battery module 2 is 2, and the deformation amount of the corresponding battery module 2 as a whole is Δ L ((L1-L2)2)+(L1-L32) And M is 3, the number of cycles of the battery module 2 is 3, and the deformation amount Δ L of the corresponding battery module 2 as a whole is ((L1-L2)3)+(L1-L33))。
2. The relationship between the acting force of the entire battery module 2 and the deformation of the entire battery module 2 is measured.
As shown in fig. 7, the four battery cells 211 of the battery pack 21 are taken out, at this time, the remaining battery cells 211 of the battery pack 21 are divided into two battery cell groups, the force application assembly 3 is placed between the two battery cell groups, the two spacers 34 abut against the two battery cell groups, the support member 33 abuts against between the two spacers 34, the air cylinder and the pressure sensor 32 are both placed in the limiting groove 331 of the support member 33, the air cylinder body abuts against one of the spacers 34, the air cylinder rod abuts against the pressure sensor 32, and the pressure sensor 32 abuts against the other spacer 34. It should be noted that, at this time, the two battery cell groups respectively abut against the two protrusions 11. Then, acting force is applied to the two battery cells in groups through the air cylinder, so that the expansion process of the battery cell group 21 is simulated, the magnitude of the acting force F is measured in real time through the pressure sensor 32, the real-time distance between the two distance measuring structures 41 and the top end of the corresponding end plate 22 is measured respectively, and a relation curve chart map2 of the acting force F of the whole battery module 2 and the change amount delta L of the whole battery module 2 is obtained through calculation. The calculation of the overall variation Δ L of the battery module 2 is the same as the calculation method in step 1, and is not described herein again.
Finally, a map3, which is a graph showing the relationship between the number of cycles of the battery module 2 and the total force of the battery module 2, can be obtained by using the maps 1 and 2. The design of the entire battery module 2 is guided by the map 3.
Through this battery module testing arrangement, just can realize the test of cycle life and expansibility relation through a battery module 2, improve the accuracy of test result, and avoided the waste of test resource, reduced the test cost. But also can be applicable to the measurement of the battery module 2 that has installed in the battery package, only need at this moment to measure the holistic bulging force of battery module 2 and the holistic deflection relational graph of battery module 2 can, combine the battery management system's of battery package measured the relation graph of the number of cycles of battery module 2 and the holistic deflection of battery module 2, can obtain the number of cycles of battery module 2 and the holistic bulging force relational graph of battery module 2.
It should be noted that, during the cycle life test of the battery module 2, the initial distance between each distance measurement structure 41 and the top end of the corresponding end plate 22 is the same, and is L; when the battery module 2 is subjected to the expansive force test, the initial distance between each distance measurement structure 41 and the top end of the corresponding end plate 22 is the same, and is L. The accuracy of the result of the test of the expansion force of the battery module 2 on the battery module 2 is ensured.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A battery module testing method, a battery module (2) comprises an electric core group (21) and two end plates (22) which are respectively arranged at two ends of the electric core group (21), and the battery module testing method is characterized by comprising the following steps:
fixing two end plates of the battery module to the supporting structure through screws respectively;
carrying out cyclic charge and discharge on the electric core group, recording the cycle number M of the electric core group in real time, and measuring the variation delta L of the distance between the top ends of the two end plates in real time to obtain a relation curve map1 of the cycle number M and the variation delta L;
taking out at least one battery cell in the battery module, and placing the force application assembly between two adjacent battery cells;
the force application assembly applies an acting force F to the electric core assembly, the magnitude of the acting force F is detected in real time, the variation delta L of the distance between the top ends of the two end plates is measured in real time, and a relation curve map2 of the acting force F and the variation delta L is obtained;
and (4) calculating a relation curve map3 of the cycle number M and the acting force F of the battery module according to the map1 and the map 2.
2. The battery module testing method according to claim 1, wherein the measuring of the variation Δ L includes: and measuring the distance change amount delta L1 from the top end of one end plate in real time through one distance measuring structure, and measuring the distance change amount delta L2 from the top end of the other end plate in real time through the other distance measuring structure, wherein the change amount delta L is delta L1+ delta L2.
3. The battery module testing method of claim 1, wherein when the force application assembly is located between two adjacent electric cores, the number of the electric cores on two sides of the force application assembly is the same in the arrangement direction of the plurality of electric cores of the electric core group.
4. A battery module testing apparatus adapted to the battery module testing method according to any one of claims 1 to 3, the battery module testing apparatus comprising:
the two end plates (22) can be respectively connected to the supporting structure through screws;
the force application assembly (3) can be arranged between two adjacent electric cores (211) instead of at least one electric core (211) of the electric core group (21), is used for applying acting force to the electric core group (21) and can detect the magnitude of the acting force in real time;
a distance measuring assembly (4) configured to measure in real time the amount of change in the distance between the tips of the two end plates (22).
5. The battery module testing device according to claim 4, wherein the supporting structure comprises a base (1), two protrusions (11) are arranged on the base (1) at intervals, two end plates (22) can be respectively fixed to the two protrusions (11) through screws, and a limiting groove (111) capable of supporting and limiting the electric core pack (21) is formed between the two protrusions (11).
6. The battery module testing device according to claim 4, wherein the force application assembly (3) comprises a force application structure (31) and a pressure sensor (32), one side of the force application structure (31) can abut against one of the battery cells (211) in two adjacent battery cells (211), the other side of the force application structure can abut against the pressure sensor (32), and the pressure sensor (32) can abut against the other battery cell (211).
7. The battery module testing device according to claim 6, wherein the force application structure (31) is a cylinder or a hydraulic cylinder, and a piston rod of the cylinder or the hydraulic cylinder abuts against the pressure sensor (32).
8. The battery module testing device according to claim 6, wherein the force application assembly (3) further comprises a support member (33), and the support member (33) is provided with a limiting groove (331) for supporting and limiting the force application structure (31) and the pressure sensor (32).
9. The battery module testing device according to claim 6, wherein the force application assembly (3) further comprises spacers (34), and when the force application assembly (3) is located between two adjacent battery cells (211), the spacers (34) are respectively arranged between the force application structure (31) and the corresponding battery cell (211) and between the pressure sensor (32) and the corresponding battery cell (211).
10. The battery module testing device according to claim 4, wherein the distance measuring assembly (4) comprises two distance measuring structures (41), the two distance measuring structures (41) are respectively located at two sides of the battery module (2), and the distance measuring structures (41) are configured to be capable of measuring the distance between the top ends of the corresponding end plates (22) in real time.
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